#include <iostream>

int main(){

    int speed = -100;
    std::cout << "速度: " << speed << std::endl;

    unsigned int age = 20;
    std::cout << "年龄: " << age << std::endl;

    unsigned int age2 = -1;
    std::cout << "年龄2: " << age2 << std::endl;

    return 0;
}